Treadle-power for grindstones



(No Model.) I 2Sheets-Sheet 1. L J. NELSON.

TREADLE POWER FOR GRINDSTONES.

No. 258,620 Patented Feb. 14,1882.

(No Model.) 2 Sheets sheet 2.

- J. M." NELSON.

TREADLE POWER FOR GBINDSTONES. NO. 253,620. Patented Peb.14I Z.-

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N. PEYERs Fhomumn n mn waihin wn, D4 C.

UNITED STATES PATENT OFFICE.

JOSHUA M. NELSON, OF OAKDALE, CALIFORNIA.

TREADLE-POWER FOR GRINDSTONES.

SPECIFICATION forming part of Letters Patent No. 253,620, dated February 14, 1882.

Application filed December 19, 1881.

To all whom it may concern Be it known that I, JOSHUA M. NELSON, of Oakdale, county of Stanislaus, State of California, have invented a Treadle-Power for Grindstones; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to a treadle-power for grindstones; and it consists in the combination and arrangement of parts, wherebya regular and continuous motion may be imparted to the stone, securing at the same time the comfort of the operator.

More particularly it consists of a suitable frame or stand carrying a grindstone and water-trough, motion being transmitted to said stone from suitable treadle-levers through theintermediate mechanism of sprocket-wheels or other similar devices, the operator being seated in an adjustable seat attached to the stand, all of which will hereinafter more fully appear, reference being made to the accompanying drawings.

Figure 1 is a perspective view. Fig. 2 isa longitudinal vertical section. Figs. 3 and 4 show details of construction.

Let A represent the frame or stand, having journaled in suitable boxes upon its top the shaft B, carrying the grindstone 0. Under this is the trough D, secured to the frame, and in which water is kept to moisten the stone. To the sides of the box are secured the stirrups or straps E, which extend downward andform bearings for the shaft F,which is suitably journaled thereon. This shaft extends across the frame parallel to the shaft B and under the trough, as shown. It carries the large sprocketwheel G, over which a chain-belt, H, passes and transmits motion therefrom to a small sprocket-wheel, I, upon the shaftB, over which it also passes. Secured to the shaft F on each side of the trough are ratchets J.

K K are the levers. These consist of two metal strips bent outward at their outer ends to support between them the swinging treadles L L, and at their inner ends journaled loosely upon the shaft F on each side of the ratchets. Bolted between the inner ends of these strips is a block, M, having in its sidea recess or socket, an. A pawl, N, lies in this groove, and is held (No model.)

out by a spiral spring, n. This pawl has a it to revolve, and will, when the treadle is raised, slip back over the ratchet for another stroke.

The treadles L L are pivoted between the outer ends of the lovers K, and are provided with straps l to secure the feet within them, so-

as to raise them upon the return-stroke.

Attached to the end of the frame A is a metal piece or support, 0, extending downwardly and bent up again, as shown. Through this support are made holes 0 to receive the shank or stem 19 of the seat P. This stem is set at an angle with the seat, and has out upon it grooves or notches c, which are pressed up against the edges of the hole in the tip or end of the support 0 by any weight in the seat. The seat is held firmly in this support by the I weight of the operator being exerted at an antreadles as to allow the operator to reach them easily.

The operation of the device is as follows: The operator sitsin the seat within convenient reach of the stone, and, placinga foot in each treadle and strappiug'them therein,works them alternately. The pawls engage with the ratchets on the downstroke and cause the shaft F to revolve. From this motion is transmitted through the sprocket-wheels G and I, belt H, and shaft B to the grindstone. The levers are returned by raising the feet. By a proper proportion between the two sprocketwheels a steady motion may be imparted to the stone and allow the levers to he worked slowly and regularly.

Although I have here shown the motion as being transmitted through the intermediate means of sprocket-wheels and chain-belt, it is obvious that I could use other means. By suitable gearing, if found preferable, the power applied to the treadle-1evers and shaft could be transmitted to the stone without materially changing the device or altering the principle.

By such means the stone could be made to turn either waya point of advantage in some cases.

Having thus described my invention, what I claim as new, and (16 ll8 to secure by Letters Patent, is-- 1. The standA,with its mounted grindstone 0, having a shaft, B, in combination with a driving-shaft, F, journaled under said stone and carrying ratchets J, and the levers K K, with their pawls N and treadles L L, and an intermediate means for transmitting the motion of the driving-shaft to the stone, substantially as herein described.

2. The stand A, with its grindstone G, shaft B,and trough D,in combination with tlieshaft F, journnled in bearings E, ratchets J, levers K K, pawls N, and swinging treadles LL, and the intermediate means for transmitting motion, consisting of the sprocket-wheels G and I and the chain'belt H, substantially as herein described.

3. The combination of the shaft F, ratchets J, and the levers K K, journaled on said shaft, and having the block M, with side sockets, m, containing pawls N and springs a, substantially as herein described.

sprocketwheels G and I, chain-belt H, side supports or bearings, E, shaft F,with its rateh ets J, levers K K, with their pawlsN and the treadles L L, and the seat P, with its stem 12, supported by the hanging piece 0, as and for the purpose herein described.

In witness whereof I hereunto set my hand.

JOSHUA l. NELSON.

Witnesses:

W. L. DUDLEY, W. M. GIBsoN. 

